Abrasive apparatus



March 20 1934. J. J. WALSH ABRASIVE APPARATUS Filed May 23, 1930 INVENTOR.

JOHN M Ma J// ATTORNEY5 Patented Mar. 20, 1934 UNITED STATES PATENT OFFICE ABRASIVE APPARATUS John J. Walsh, Philadelphia, Pa., assignor to The Stratmore Company, Cleveland, Ohio, a corporation of Ohio Application May 23, 1930, Serial No. 455,088

1 Claim.

The present invention, relating, as indicated, to an abrasive wheel, is more particularly directed to a means of mounting a wheel of the grinding stone type in such a manner that the stone is resilient with respect to the surface upon which it acts. This resilient mounting of an abrasive wheel of the hard abrasive type has many advantages, the most important of which are, ease in working upon irregular surfaces, freedom from hand strain, and lack of jolting. Obviously, a grinding stone which can be tilted with respect to the shaft which rotates it is to be greatly desired. The same is true of a grinding stone or abrasive disc which can be operated without producing any jarring or straining of the hand, such as is present with the abrasive wheels now in use, A natural result of freedom from hand strain is better work because of the ease with which the abrading can be performed, which is extremely favorable as compared with the jolting devices heretofore in use. This jolting which is more or less of a jumping action obtained from the reaction of the meeting of two unyielding surfaces, one of which is rotating rapidly, is well known to those skilled in the art, and has presented a very serious problem, not only because of the personal discomfort occasioned thereby but also because of the ridges produced which obviously are highly undesirable.

Heretofore, grinding stones have been mounted on rotatable shafts, but in all of such mountings the connection between the stone and the shaft has always been a rigid one resulting in the stone revolving in a plane at right angles to the axis of the shaft. This type of mounting had several disadvantages, the most important of which was the liability of scoring the surfaces to be abraded because of pressure being exerted upon the grinding wheel. The present invention does away with such disadvantages and provides a resilient mounting so that the grinding stone may assume other than a right angular relationship with respect to the shaft, and also a resilient relationship with respect to said shaft.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claim; the annexed drawing and the following description setting forth in detail one method and one product exemplifying my invention, such disclosed procedure and product constituting, however, but one of various applications of the principle of my invention.

In said annexed drawing:--

Fig. 1 is a plan view taken from above of Fig. 2; and Fig. 2 is a section on the line 22 of Fig. 1 taken in the direction indicated.

Referring now to Fig. 2, a plate 1 is shown hav- Gill ing a hub 2, in which there is a screw threaded aperture 4 provided for the reception of a shaft (not shown), and this hub when engaged with the shaft forms a rigid connection to the source of power. The plate 1 has a number of apertures therein, two of which are shown at 13 and 13' and are larger in diameter than the diameter of studs 6 and 6' so that said studs may move therein. The upper end of stud 6 has a head 3 thereon, and a lock nut 7 is mounted between the head 3 and the flange 1 so that the plate 1 may be moved toward and away from the plate 5 and held in the desired position. The other stud 6 has corresponding elements 3 and 7' which perform the same function. The screw threaded extremity of the stud 6, for instance, is screwed into a threaded aperture 12 located in the plate 5 so that a fixed or immovable connection is obtained between the studs and the before mentioned plate 5. The plate 5 is shown to be of larger diameter than the plate 1, but obviously the size depends upon the work in hand and is immaterial as far as this invention is concerned. This plate 5 has attached to its outer face by glue or some such similar means a grinding wheel 8 which may be of stone. In order to keep the two plates apart a coil spring 9 is interposed between them, and this spring seats around the opposing circular projections 10 and 11 on the plates 5 and 1, respectively. It will be noted that the projections prevent inward movement of the springs and that the bolts prevent any outward movement so that no matter what the operating conditions are, the spring will always remain in place. The action of the spring tends to keep the plates apart, but when pressure is applied on one side of the grinding wheel the bolts on that side will move with respect to plate 1, and thus allow plate 5 and the grinding wheel to assume positions which are not at right angles to the connecting shaft.

From the foregoing description it will be apparent that I have provided a resilient means of mounting a grinding wheel of hard material, and that such mounting does away with all danger of scoring the surface to be abraded, which is usually attendant upon rigidly mounted abrading wheels. It will also be noted that the plane of the grinding wheel may be other than at right angles to the axis of the rotating shaft, and this results in ease in abrading curved and irregular surfaces. A further advantage incorporated in a resilient mounting such as I have provided is the total absence of hand strain which is usually present with rigidly connected abrading wheels.

As another and very important advantage the improved mounting which I have described and illustrated will be seen to produce a much more efficient means of abrading because of the resilience which eliminates all jolting or bumping, and results in a smooth flat surface being obtained. This jolting or bumping is prevalent in all conventional abrading wheels of the hard abrasive type, and defeated the object of such devices by producinug ridges or waves.

Other modes of applying the principles of my invention may be employed instead of the one explained, change being made as regards the means 

